Optical Nanodiamond Hyperpolarizer for NMR Signal Enhancement
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Solution Overview
Problem
Current NMR and MRI technologies face challenges with low sensitivity, requiring expensive and sophisticated magnets for polarization and signal detection, and existing Dynamic Nuclear Polarization (DNP) methods are costly and require cryogenic conditions, limiting the accessibility of portable and room-temperature DNP solutions for enhancing NMR signals.
Innovation Solution
A fast field cycling device capable of sweeping magnetic fields over a ten-order-of-magnitude range from 1 nT to 7 T in under 700 ms, combined with a novel optical dynamic nuclear polarization technique, enhances 13C polarization by five orders of magnitude at 8 mT, allowing for efficient spin lifetime measurements and inductive readout at high fields, and a compact, inexpensive nanodiamond hyperpolarizer for room-temperature operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional DNP methods are used to enhance NMR signals, then signal sensitivity is improved, but system cost and operational complexity increase significantly
Solution Approach 1:
The patent replaces the mechanical/superconducting magnet system with an optical system. Specifically, it uses optically addressable Nitrogen-Vacancy (NV) centers in diamond to generate electron spin polarization, which is then transferred to nuclear spins for NMR signal enhancement. This substitution eliminates the need for expensive superconducting magnets and cryogenic infrastructure, achieving DNP signal enhancement through optical excitation and microwave control instead.
Solution Approach 2:
The patent changes the operational parameters from cryogenic temperatures to room temperature operation. By utilizing NV centers in diamond that maintain long spin coherence times at room temperature, the system achieves DNP enhancement without requiring cryogenic cooling infrastructure, thereby reducing system complexity and operational costs while maintaining signal sensitivity.
2Measurement precision
If expensive superconducting magnets are used for polarization and detection, then NMR signal quality is improved, but system accessibility and portability deteriorate
Solution Approach 1:
The patent replaces the expensive superconducting magnet infrastructure with a compact optical system based on NV centers in diamond. The system uses lasers for optical excitation and microwave generators for spin control, eliminating the need for large-scale magnetic infrastructure. This makes high-quality NMR signal generation accessible in portable, table-top configurations that can be deployed in various settings without requiring specialized facilities.
3Productivity
If cryogenic conditions are used for DNP, then polarization efficiency is improved, but operational simplicity and portability worsen
Solution Approach 1:
The patent changes the temperature parameter from cryogenic to room temperature operation by utilizing NV centers in diamond. These centers exhibit long electron spin relaxation times (T1 > 10 ms) and long spin coherence times even at room temperature, enabling efficient polarization transfer to nuclear spins without requiring cryogenic cooling. This eliminates complex cryogenic infrastructure while maintaining high polarization efficiency.
4Reliability
If high magnetic fields are used for spin control, then quantum information storage is improved, but field inhomogeneity and control complexity increase
Solution Approach 1:
The patent replaces the high magnetic field approach with an optical control mechanism using NV centers. The NV center electron spins are optically initialized and controlled using laser excitation and microwave pulses, which provide precise quantum control without requiring high magnetic fields. This reduces field inhomogeneity issues and simplifies the control system while maintaining reliable quantum information storage through the long T1 times of the NV electron spins.
Data Source
AI summary
A system can include: a superconducting or permanent magnet; a high field portion corresponding to the superconducting or permanent magnet, wherein the high field has a range of 0.1-20 T; a low field portion positioned outside of the superconducting or permanent magnet, wherein the low field has a range of 0.01 nT-100 mT; a shuttling mechanism configured to deliver a sample between the low field portion and the high field portion; and a polarization sub-assembly configured to hyperpolarize the sample while the sample is within the low field portion. A device can be configured to cause nuclear spin hyperpolarization in diamond particles such that the hyperpolarization is transferable to at least one of an external liquid or an external solid. A process of hyperpolarizing substances can include applying optical illumination to the substance, irradiating the substance with a series of microwave signals as one of either a single signal or as a frequency comb to hyperpolarize the nuclei in the substance, and relaying polarization to nuclear spins of one of a surrounding solid or fluid.